<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-button type="primary" @click="showAddCateDialog"
          >添加分类</el-button
        >
      </el-row>
      <tree-table
        :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        :show-index="true"
        index-text="#"
        border
        class="treeTable"
      >
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            v-show="!scope.cat_deleted"
            style="color: lightgreen;"
          ></i>
          <i
            class="el-icon-error"
            v-show="scope.cat_deleted"
            style="color: red;"
          ></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level === 0">一级</el-tag>
          <el-tag
            size="mini"
            type="success"
            v-else-if="scope.row.cat_level === 1"
            >二级</el-tag
          >
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <template slot="opt" slot-scope="">
          <el-button type="primary" icon="el-icon-edit" size="mini"
            >编辑</el-button
          >
          <el-button type="danger" icon="el-icon-delete" size="mini"
            >删除</el-button
          >
        </template>
      </tree-table>
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page="queryInfo.pagenum"
        :page-sizes="[3, 5, 10, 15]"
        :page-size="queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper"
        :total="total"
      >
      </el-pagination>
    </el-card>
    <!-- 添加分类对话框 -->
    <el-dialog
      title="添加分类"
      :visible.sync="addDialogCateVisible"
      width="50%"
    >
      <el-form
        :model="addCateForm"
        :rules="addCateFormRules"
        ref="addCateFormRef"
        label-width="100px"
      >
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input> </el-form-item
        ><el-form-item label="父级分类">
          <el-cascader
            props.expand-trigger="hover"
            :options="parentCateList"
            :props="cascaderProps"
            :v-model="selectKeys"
            @change="parentCateChange"
            :clearable="true"
            :change-on-select="true"
          >
          </el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addDialogCateVisible = false">取 消</el-button>
        <el-button type="primary" @click="addDialogCateVisible = false"
          >确 定</el-button
        >
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5
      },
      catelist: [],
      total: 0,
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      addDialogCateVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          { required: 'true', message: '请输入分类名称', trigger: 'blur' }
        ]
      },
      parentCateList: [],
      cascaderProps: {
          value: 'cat_id',
          label: 'cat_name',
          children: 'children'
      },
      selectKeys: []
    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('/categories', {
        params: this.queryInfo
      })
      if (res.meta.status !== 200) {
        return this.$message.error('商品分类获取失败')
      }
      this.catelist = res.data.result
      this.total = res.data.total
    },
    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    showAddCateDialog() {
      this.getParentCateList()
      this.addDialogCateVisible = true
    },
    async getParentCateList() {
      const { data: res } = await this.$http.get('/categories', {
        params: { type: 2 }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取父级分类数据失败')
      }
      this.parentCateList = res.data
    },
    parentCateChange() {
        console.log(this.selectKeys)
        //如果selectkeys中有元素表示选择了父级分类，反之则没有
        if(this,selectKeys.length > 0) {
            this.addCateForm.cat_pid = this.selectKeys[this.selectKeys.length-1]
            this.addCateForm.cat_level = this.selectKeys.length
            return
        }else {
            this.addCateForm.cat_pid = 0
            this.addCateForm.cat_level = 0
        }
    }
  }
}
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
</style>
